android：scaletype...属性和照相获取图片并进行显示

ImageView的属性android:scaleType，即 ImageView.setScaleType(ImageView.ScaleType)。android:scaleType是控制图片如何 resized/moved来匹对ImageView的size。

CENTER /center  按图片的原来size居中显示，当图片长/宽超过View的长/宽，则截取图片的居中部分显示

CENTER_CROP / centerCrop  按比例扩大图片的size居中显示，使得图片长(宽)等于或大于View的长(宽)

CENTER_INSIDE / centerInside  将图片的内容完整居中显示，通过按比例缩小或原来的size使得图片长/宽等于或小于View的长/宽

FIT_CENTER / fitCenter  把图片按比例扩大/缩小到View的宽度，居中显示

FIT_END / fitEnd   把图片按比例扩大/缩小到View的宽度，显示在View的下部分位置

FIT_START / fitStart  把图片按比例扩大/缩小到View的宽度，显示在View的上部分位置

FIT_XY / fitXY  把图片不按比例扩大/缩小到View的大小显示

MATRIX / matrix 用矩阵来绘制，动态缩小放大图片来显示。

下面是我写的通过照相获取图片并进行截取，然后显示在imageview中

photo_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="click1"
        android:text="photo" />
    <Button 
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="click2"
        android:text="xiangche"/>

    <ImageButton
        android:id="@+id/picture1"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:layout_gravity="center_horizontal"
        android:scaleType="fitXY"
         />

</LinearLayout>

然后是activity

package com.example.photo;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;

import com.example.dazuoye.R;

import android.annotation.TargetApi;
import android.app.Activity;
import android.content.ContentUris;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BitmapFactory.Options;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.provider.MediaStore.Images.Media;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.Toast;

public class tupian extends Activity {
    public static final int TAKE_PHOTO=1;
    public static final int CROP_PHOTO=2;
    public static final int CHOOSE_PHOTO=3;
    
    private Uri imageUri;
    private ImageView picture;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.photo_layout);
        picture=(ImageView) findViewById(R.id.picture1);
       WindowManager wm=(WindowManager) getSystemService(WINDOW_SERVICE);
//       int height=wm.getDefaultDisplay().getHeight();
//       int width=wm.getDefaultDisplay().getWidth();
//       System.out.println("width"+width+"height"+height);
       
    }
    
    public void click1(View v){
        File outputImage=new File(Environment.getExternalStorageDirectory(), "output_image.jpg");
        try{
            if(outputImage.exists()){
                outputImage.delete();
            }
            outputImage.createNewFile();
        }catch(IOException e){
            e.printStackTrace();
        }
        
        imageUri=Uri.fromFile(outputImage);
        Intent intent=new Intent("android.media.action.IMAGE_CAPTURE");
        intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
        
        startActivityForResult(intent, TAKE_PHOTO);
    }


    
    public void click2(View v){
        Intent intent=new Intent("android.intent.action.GET_CONTENT");
        intent.setType("image/*");
        startActivityForResult(intent, CHOOSE_PHOTO);
    }
         
    @Override
    protected void onActivityResult(int requestCode,int resultCode,Intent data){
        switch(requestCode){
        case TAKE_PHOTO:
            if(resultCode == RESULT_OK){
                Intent intent=new Intent("com.android.camera.action.CROP");
                intent.setDataAndType(imageUri, "image/*");
                intent.putExtra("scale", true);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
                startActivityForResult(intent, CROP_PHOTO);
            }
            break;
        case CROP_PHOTO:
            if(resultCode==RESULT_OK){
                try{
                    
                
                    
                    Bitmap bitmap=BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));
//                    int imgwidth=bitmap.getWidth();
//                    int imgheight=bitmap.getHeight();
//                    System.out.println("heightasd"+imgheight+"width"+imgwidth);
                    System.out.println("sad");
                    
                    picture.setImageBitmap(bitmap);
                }catch(FileNotFoundException e){
                    e.printStackTrace();
                }
            }
            break;
    
            default:
                break;
        }
    }




    
    
}